code: def transform_corpus(self, model, corpus):
      model.add_and_switch_to_new_task(
          task_name="2_CLASS",
          label_dictionary=corpus.make_label_dictionary(
              self.train_label_type
          ),
          label_type=self.train_label_type,
      )
      return corpus
  
file_path: flair/tests/models/test_tars_classifier.py
imports: import pytest
  from flair.data import Sentence
  from flair.datasets import ClassificationCorpus
  from flair.embeddings import TransformerDocumentEmbeddings
  from flair.models import TARSClassifier
  from tests.model_test_utils import BaseModelTest
label_desc: Use image node_id 5 for calling the TestTarsClassifier obj's underlying member method code with example usage: obj.transform_corpus(model, corpus) and returns: corpus